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CH145327A - Process for the preparation of an azophthalein dye. - Google Patents

Process for the preparation of an azophthalein dye.

Info

Publication number
CH145327A
CH145327A CH145327DA CH145327A CH 145327 A CH145327 A CH 145327A CH 145327D A CH145327D A CH 145327DA CH 145327 A CH145327 A CH 145327A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
azophthalein
acid
red
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH145327A publication Critical patent/CH145327A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

      Verfahren    zur Darstellung eines     Azophtaleinfarbstoffes.       Gegenstand dieser Erfindung ist ein Ver  fahren zur Darstellung eines     Azophtalein-          farbstoffes    von nachstehender Formel:  
EMI0001.0005     
    welches dadurch gekennzeichnet ist, dass man  den     Monoazofarbstoff    aus     Anthranilsäure     und     Resorcin    mit     Dimethylamido-m-oxyben-          zoylbenzoesäure    im Verhältnis gleicher Mole  küle kondensiert.  



  <I>Beispiel:</I>  26 Teile des Farbstoffes aus     Anthranil-          säure    und     Resorcin    werden mit 28,5 Teilen       Dimethylamido    - m -     ogybenzoylbenzoesäure     vermischt und eingetragen in 300 Teile kon-    zentrierte Schwefelsäure. Man rührt 24  Stunden bei<B>80',</B> giesst in Wasser und     fil-          triert    die vollständig ausgeschiedene     Farb-          stoffsäure    ab. Sie bildet getrocknet ein  dunkles Pulver, das sich in Wasser auf Zu  satz von Alkalien rot, in konzentrierter  Schwefelsäure braun löst.

   Die     nachchromier-          ten    Färbungen auf Wolle und Seide des nach  bekannten Verfahren in das     Alkalisalz    über  geführten Farbstoffes sind braunrot.



      Process for the preparation of an azophthalein dye. The subject of this invention is a process for the preparation of an azophtalein dye of the following formula:
EMI0001.0005
    which is characterized in that the monoazo dye from anthranilic acid and resorcinol is condensed with dimethylamido-m-oxybenzoylbenzoic acid in proportions of the same molecules.



  <I> Example: </I> 26 parts of the dye made from anthranilic acid and resorcinol are mixed with 28.5 parts of dimethylamido - m - ogybenzoylbenzoic acid and added to 300 parts of concentrated sulfuric acid. The mixture is stirred for 24 hours at <B> 80 ', </B> poured into water and the completely separated dye acid is filtered off. When dried, it forms a dark powder that dissolves red in water with the addition of alkalis and brown in concentrated sulfuric acid.

   The re-chromed dyeings on wool and silk of the dye converted into the alkali salt by known processes are brown-red.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- phtaleinfarbstoffes, dadurch gekennzeichnet, dass man den Monoazofarbstoff aus Anthra- nilsäure und Resorcin mit Dimethylamido-m- oxybenzoylbenzoesäure kondensiert. Der Farbstoff ist ein dunkles Pulver, das sich in Wasser rot, in konzentrierter Schwefelsäure braun löst. Die nachchromierte Färbung ist braunrot. PATENT CLAIM: Process for the preparation of an azophthalein dye, characterized in that the monoazo dye from anthranilic acid and resorcinol is condensed with dimethylamido-m-oxybenzoylbenzoic acid. The dye is a dark powder that dissolves red in water and brown in concentrated sulfuric acid. The chromed color is brownish red.
CH145327D 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye. CH145327A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE145327X 1928-05-24
CH142447T 1929-05-21

Publications (1)

Publication Number Publication Date
CH145327A true CH145327A (en) 1931-02-15

Family

ID=25714076

Family Applications (1)

Application Number Title Priority Date Filing Date
CH145327D CH145327A (en) 1928-05-24 1929-05-21 Process for the preparation of an azophthalein dye.

Country Status (1)

Country Link
CH (1) CH145327A (en)

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